|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|siphonophore (sī-fŏn'ə-fôr', sī'fə-nə-) Pronunciation Key
Any of various transparent, often subtly colored marine cnidarians of the order Siphonophora, consisting of a delicate floating or swimming colony of polyplike and medusalike individuals. Siphonophores can reach lengths of 40 m (131 ft), making them longer than blue whales. The Portuguese man-of-war is a siphonophore.